I bought this memory for cheap: GeIL GS38GB1066C7DC PC3-8500 (DDR3-1066) DDR3 (SODIMM) CAS Latency 7 I was assuming it would work in my MBP 2011 13" but it doesn't. When I boot there are some frequent short beeps played. Nothing else happens. Any ideas? I put the standard memory back and that works fine.